Question

I want to drag an uiimageview only in horizontal from a point1 to a point2; how can I do it?

Answer 1

you can use somting like this:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
      touchStart = [[touches anyObject] locationInView:/*your main view*/];
        point1 = CGPointMake(140, 140);
        oldrect = imgview.rect;

}

    - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
      CGPoint point = [[touches anyObject] locationInView:/*your main view*/];
      imgview.center = CGPointMake(imgview.center.x + point.x - touchStart.x, imgview.center.y);
    }

    -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
        CGPoint point = [[touches anyObject] locationInView:/*your main view*/];

    [UIView animateWithDuration:0.25
                         animations:^{

    if (((point1.x -15) > point.x) && ((point1.x + 15 ) < point.x) {
            Imgview.rect = CGRectMake(point.x, point.x, imgview.frame.size.width,imgview.frame.size.height);
        }
    else {Imgview.rect = oldrect;}
                         completion:^(BOOL finished){ }];}  }